diff -r 14ace97ffed8 -r c9a79b432907 hgext/evolve.py
--- a/hgext/evolve.py	Tue Sep 13 00:56:57 2016 +0200
+++ b/hgext/evolve.py	Tue Sep 13 01:25:17 2016 +0200
@@ -2008,7 +2008,7 @@
     repo.ui.status(_('computing new diff\n'))
     files = set()
     copied = copies.pathcopies(prec, bumped)
-    precmanifest = prec.manifest()
+    precmanifest = prec.manifest().copy()
     # 3.3.2 needs a list.
     # future 3.4 don't detect the size change during iteration
     # this is fishy